Call charging telephone system



July 11, 1933. v E. HAGUE 1,917,884

CALL CHARGING TELEPHONE SYSTEM Filed March so, 1952 15 Sheets-Sheet 1 FIG.

MARG/NAL INVENTOR A. E. HAGUE A T TORNE Y y 11, 1933- A. E. HAGUE CALL CHARGING TELEPHONE SYSTEM 15 Sheets-Sheet 2 Filed March 30, 1932 [IHI- new n1 w .L W M W W M w M n w New 9? N b\.\ I 02 A TTORNEV July 11, 1933. A. E. HAGUE 1,917,884

CALL CHARGING TELEPHONE SYSTEM Filed March 30, 1932 15 Sheets-Sheet 3 MARC/NA L INVENTOR A. E. HA GUE A TTO/PNE) y 1933- A. E. HAGUE CALL CHARGING TELEPHONE SYSTEM Filed March 30, 1932 15 Sheets-Sheet 4 VIE stlrl A T TOPNE V July 11, 1933. A. E. HAGUE 1,917,884

' CALL CHARGING TELEPHONE SYSTEM Filed March 30, 1932 15 Sheets-Sheet 5 M ms \0 +17. +8, 5/9

an M6 INVENTO/P A. E HAGUE aam A TTORNEV July 11, 1933. A. E. HAGUE CALL CHARGING TELEPHONE SYSTEM Filed March 30, 1932 15 Sheets-Sheet 6 INVENTO/P A. 1 HA GUE A T TORNEV M 11, was. A HAGUE 12,917,884

CALL CHARGING TELEPHONE SYSTEM Filed March 30, 1952 15 Sheefs-Sheet 7 INVENTOR A. E. HA CUE A T TORNE V y My 1933- A. E. HAGUE CALL CHARGING TELEPHONE SYSTEM 'Filed March 30, 1952 15 Sheets-Sheet 8 lNl/E/VT'OP Ai. HA UE ATTORNEY July 11, 1933. A. E. HAGUE CALL CHARGING TELEPHONE SYSTEM Filed March so, 1952 15 Sheets-Sheet 9 TIN h :8

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INVEN r00 A. E. HAGUE .4 TTOR/VEY y 11, 1933- A. E. HAGUE 1,917,884,

- CALL CHARGING TELEPHONE SYSTEM Filed March 30, 1952 15 Sheets-Sheet l0 /o2o F7510 mao INVEA/ TOR A. E. HAGUE July 11, 1933. A. E. HAGUE 1,917,884

CALL CHARGING TELEPHONE SYSTEM Filed March 30, 1932 15 Sheets-Sheet ll FIG/l INVENTOR AE. HA GUE A 7'TORNE Y July 11, 1933. A, E, HAGUE 7 1,917,884

CALL CHARGING TELEPHONE SYSTEM Filed March so, 1932 15 srieets-sheet 12 INVENTOR A .5. HA GUE @Pam A T TORNE V July 11, 1933. HAGUE CALL CHARGING TELEPHONE SYSTEM Filed March 30, 1932 15 Sheets-Sheet 13 AE. HAGUE 8y ATTORNEY y 1933- A. E. HAGUE CALL CHARGING TELEPHONE SYSTEM 15 Sheets-Sheet 14 Filed March 30, 1932 INVENTOR 14.5. HAGUE ATTORNEY July 11, 1933. A. HAGUE CALL CHARGING TELEPHONE SYSTEM Filed March so, 1932 15 Sheets-Sheet 15 INVENTOR A. E. HAGUE Q at m K b ut S at mat N at w wt E at v at w wt Qot Qut m wt 9k \GR Sui QQR TQMQO OR m III] B \J, wuthd qv$ 2x Ill JU [U D U Ill .U 3 ll U D U U IllllI-IIII 3 D] III D A TTORNEY Patented July 11, 1933 UNITED STATES PA TENT Oj-F-F ALFRED E. HAGUE, OF WEST ORANGE, NEW JERSEY, .ASSIGNOR 1'0 BELL "TELEPHONE LABORATORIES, INCORPORATED, OF *NEW YORK, N. Y., A CORPORATION 0'1 NEW YORK "CALL CHARGING TELEPHONE SYSTEM Application :filed liiareh 30, 1932. Serial .No. 601,986.

This invention relates to telephone ex change systems and more particularly to systems in which automatic switches are employed in-the establishment of connections 5 and in which charges are assessed for calls by means of coin boxes associated w-i-thsubstations of calling lines.

rrn ob j ect of theinventionis to enable the subscriber to continue conversation over a plurality of unit periods of conversation by supplying him with a warning tone to deposit another coin or token after eachperiod and by automatically collecting the same for each elapsed period without the necessity oi calling in a monitoring operator to perform either or both of these functions.

In automatic telephone systems where connections are established under the control of register senders, a sender is associated with a calling subscribers line during the establishment of a connection :and is then disnii' ed. If the calling line is equipped with a. coin box it is necessary to collect or refund the coin and in order to avoid the ruse of the sender in performing thisfunction, the most recent practice makes use of .a simple coin box control circuit which, like the register senders may be used in common any one of a plurality of associated connections. A plurality of these common control circuits is provided, any "one of which may be seized and associate; with an established connection upon the termination of the conversation over said established connection. A circuit of this character is disclosed in the Patent 1.575.336, issued ,March 2, 1920M) I. Henry.

The methods of controlling coin .collection above referred to, however, make :provision for charging for an associated concti on only on the basis of :a singlewcharge for 116 period of conversation. In order, how r 1', that for extendedconversations the operating company may be more eqnitably 't'Olll lOllSfllleCl for the prolonged zuse of its equipment, it is desirable that the initial apericd of conversation for a single charge be automatically timed and limited and. if the (.OIETDI'SHfiOI] continues :beyond this lin1it,en additional coin should be requested and col- .versation. A circuit of this. character is disclosed in the Batent,1,823,0l0,issued-Septemher 15., 1931 to A. E. Hague, wherein {a coin monitoring operator is brought, in onthe .established connection after the initialperiod of conversation and the calling subscribe apprised that an additional coin or token is required to preserve the established connection for anadditional period of conversation.

It has been found, however, that-monitor ing service is costly in that it requires the services of a considerable number of o erator-s and also because it adds to the holding time of the connection. ThQ-PI'GSBIltiIH'BIl- .tion, therefore-has for its object the elimination of this monitoring service by pro-riding a warning tone to the subscriber near the end ofthe conversation period simultaneously with the automatic collection .of the .coin and the undisturbed continuation of the conversationthereaftcr if another coin is deposited. In accordance with the present invention this desirable function "has -.bee1-1;ineorporated in circuits which are in some respects similar to "the-circuits disclosed in the ,aiore n-ien-tioned Patent to A. Hague. Every "line finder district link is provided, theueiore, with a timing switch whichis started upon the response of. the called subscriber and advanees through acyclete measure-the prescribed unit period for conversation. 1Common .toa group of finder district links, a plurality of coin hex control circuitsis pro vided, --each equipped with apparatus tor either applying .coin collecting or coin refiund-ing current to the coin box of thecal ling line, and each haying individual thereto a himting switch for associating the control circuit with a line finder-distirict-selector link circuit.

The timing circuit is arranged to close a start circuit ZEor all :idle coin control switches just prior to the cempletion ioztitsitiming cycle for causing the association of an idle .control circuit with the link. The first idleicom trol. circuit switch to findthelinlris arrested to seize the link and the other huntingswitches of other control circuits are also arrested.

- U;pon the association of the control circuit with the link, the calling line vis disconnected 1 the subscribers instrument for the purpose 0f apprising him that the period of conversation is terminated and that another coin is required before conversation may be resumed. A small interval of time is now measured by a simple timing circnitfor giving the subscriber an opportunity to deposit another 'coin.

At the end of this period a test is made by the timing circuit to determine whether or not the subscriber has deposited another coin. If the test indicates that the ing connection, which was momentarily dissubscriber has deposited the coin, the talkrupted, is reestablished and the subscribers are permitted to continue their conversation.

' link causes a lamp to be lighted at an opera- Should the test, however, indicate that the subscriber has not deposited another coin but is still on the line, the timing switch of the tors position to inform her that thesubscriber has failed to deposit another coin as suggested to him by the warning tone. The operator thereupon plugs a cord circuit into a jack of the link for the purpose of determining if the calling subscriber desires to continue the conversation for an additional timed pesires to so continue by depositing an addi-' riod. If the subscriber intimates that he detional'coin, the operator then disconnects and the timing switch advances through an i other cycle again causing the association of a control circuit with the link for the collection of the deposited coin, supplying warning tone to the subscriber and testing again for the presence of an additional coin for an additional over-time perlod and upon failure to deposit said coin again bringing 1n the monitoring operator. The circuits then continue to function in this manner as long as the calling subscriber desires to maintain the connection and deposits a coin for each additional over-time period of conversation. In

T this manner the number of monitoring operators is considerably reduced in that an operator is now brought in on the connection onlyif the subscriber fails to deposit the additional coin in response to the warning tone;

A clearer understanding of the purpose and scope of the invention will be obtained from a consideration of the following description 1n connection with the attached 1 the group Fig. 2 shows a start circuit serving a plurality of groups of lines;

Figs. 3 and 13 taken together show a line finder district selector link circuit for extending a connection from the calling line, Fig. 3 showing the line finder and Fig. 13 showing the district selector together with a sequence switch for controlling the circuits of the line finder and district selector;

Fig. 4 shows one of a plurality of link circuits serving the subgroup including the calling line 100;

Figs. 5 to 10 inclusive and Fig. 12 show the circuits of a register sender adapted to be selected by the link circuit of Fig. 4 and to control selector switches in their selective movements Fig. 11 shows one of a plurality of coin box control circuits embodying, in part, the present invention;

Fig. 14 shows a timing circuit individual to the line finder district selector link circuit of Figs. 3and 13;

Fig. 15 shows in diagrammatic form the switches necessary to establish connections from the district selector of Fig. 13, and

Fig. 16 is a diagram showing the manner in which the several figures of the drawing should be arranged to show the complete circuits of the invention.

Subscribers lines, such as line 100, are connected to multiple terminals appearing be fore a plurality of line finders. These multiple terminals are arranged in a plurality of groups, each group being served by a separate brush-set on each finder and each group being divided into two subgroups, A trip circuit is provided individual to each group; a start circuit is provided for all the groups of lines served by the group of line finders: and a plurality of link circuits is provided for each group of lines and line finders. The line finders and link circuits are divided into two subgroups and each subgroup normally serves calls in the corresponding subgroup of lines. The arrangement is such that, except when all link circuits are busy, a particular link circuit will be in readiness to serve a call and will be connected by its district finder to an idle line finder.

When a call is initiated by a subscriber in a particular group, the trip circuit individual to the group and the start circuit common to a plurality of trip circuits are taken for use by that line and means are provided for preventing the extension of a call in the other subgroup of the group or in any other group until the line finder has been started in search of this calling line. Means are also provided for preventing the extension of a second call in this group until after simultaneous calls in other groups have been taken particular link is taken for use with. a call the next link is allotted to serve the next initiated call in the particular subgroups which it serves. As soon. as. a brush setonthe line finder has been tripped the start circuit is freed to permit the extension of calls in other groups. As soon asv the line has been found the trip. circuit of the group is freed by the line finder toextend another call in the. same group provided no call isawaiting extension in another group. As. soonas selections. are completed the sender and: link circuit are releasedbythe district selector cincuit and. the link circuit immediately hunts for another idle district selector.

Substation 100. is one at which a coin. box is located for. the purpose of requiring prepayment for calls. Substations; of this; type are served by register senders which are arranged to preventthe completion of a. connection unless the required coin is deposited in said; coin box.

Ezvtension of a local connection When the subscriber at substation 100 removes his receiver from, the switchhoo-lr a circuit is closed for line relay 101 extending from battery through that relay, inner: contact of relay 102 over the line loop to ground at the outer contact of relay 102;, Relay 101 operates and closes, a circuit. from battery, througl-i the left windingof relay 103, right back contact of; relay 104 to ground at the outer contact of relay 101, and, at its inner front contact, connects batter-y through resistance 11-1 and theleft winding of relay 109. in parallel to conductor 1.14 to: mark the line as calling.

The operation of relay 103' opens at its right back contact the operating circuit of relay lwhich serves the second subgroup of the grouptowhich line 100 belongs, thus pip-renting the extension of a connect-ion from that subgroup while the tripicircuit is being used with line 100. At its middle left contact relay 103 establishes a circuit for the trip relay. 108 extending from battery, left back. contact of relay 201, conductor-130, right winding of relay 108, inner left back contact of, relay 107', left. back coiita-c-tv of relay 10$).to ground at, the middleleft front contact of relay 10.3. Relay. 108 operates and locks from battery, through the right winding-of relay 201, conductor 129,, back contacts of relays similar to relay. 108. ind-i.- vidnal to other subgroups of lines appearing before the same line finder, innerleft front contact and left. winding of relay 108, righ-t back contact. of relay 109. to ground at the middle left front. contact of relay103. 1 Relay 108 at its outer-right front. contact est-ah lishes a circuit for operating the trip magnet 303 of the line finder of Fig. Relay; 201 operates in the lockingcircuit' of relay 108 1 and, in combination therewitl-r, closes: acirc-uit. from ground at its outer right contacts, over conductor 12 8,. the inner right contact of relay 108. to battery through the; winding of relay 1'10. Relay 110 operates. and; looks over its inner right/contact; the left. back: contact ofi relay 109 to. ground. at the middle lett contact of relay 103: and at. its. outer con. tact establishes a; circuit for startingan alllotted line finder.

Assuming that'thev link and? line. finder show-n: are the onestobe. used next, sequence switch 400willbestanding imposition I and sequence switch. 1300M position 2.. The op eration of: relay 110 will therefore close a circuit from ground at. its. outer right contact, theouter left. contact. of relay 108', the inner-left front contactzof -relay 103, conductor 131, the left. back contacts. of relay 202', the left back contacts ofrelay 203-, cons ductor 206', the: upper left and lower right contacts ofcain 403,, brush 402 and terminal 401, conductor 3:78, the. lower right and up per left contacts of. 1301 to battery through the winding of relay 302.

Relay 302; in. operating, closes a holdingc-ircuit for itself" over its. inner right front contact, the lower and upper left contacts of cam 1302, the back.- contact Off "relay .301 to ground over colnniutatonse-gmentr 304; and

brush. and, at itsirmer left front contact,

establishes a circuit: for-the up drive: magn-eti 3000f thel'inefind er extending over the upper contact of canr 1303;. outer: rightzfront contact of relay 302. to. ground at the upper left contact of; cam 13045.. The line finder moves upwardly under the control of magnet 300 andsince-trip magnet303. is operated, the proper of brushes-is tripped. Relay 3102" also. establishes a: circuit. from. ground at the; upper left contact of cam1304,ouer

the outer right. front. Contact, of," relay 302; lower left contact of cam, 1330.5, conductor 37,9, terminal 407', brush. 406, upper: right and lower left. contacts. of. ca1n4-z05, conductor right; winding of" relay 203.110 battery at: the inner. left normal. contacts;- of' relay 208. Relay. 20.3v operates. and; opens;- at: its leftback: contacts. the initial operating circuit of: relay- 302. As soonas commutator brush. 3-06 engages: segment 307. a circuit is established from ground. on brush 3.06., left contactsof cam 1306., conductorl, contact 230; of key 204", inner right. contact of relay 201 to conductor:- 129 and. the right; contact of relay 201. This. ci-rcu'i-tishuntsnthe winch l tact ofcam 1401, conductor 312, winding of relay 301, conductor 313, upper left and lower right contacts of cam 1307 to ground. Relay 301 operates in this circuit and closes a shunt around its winding from ground on brush 305, segment 304, front contact of relay 301, conductor 314, left contact of cam 1402, conductor 315, resistance 1308, conductor 316 to brush 308. This reduces the resistance in series with the winding of marginal relay 109 sufficiently to cause that relay to operate and open the locking circuit of relay 110. The operation of relay 301 also opens the locking circuit previously traced for relay 302 and relay 302 releases as soon as the line finder brushes are centered on the calling line terminals when commutator brush 317 will be in engagement with an insulating portion of centering segment 318. The release of relay 302 opens the circuit of up-drive magnet 300 and establishes the circuit of cut-off relay 102 from battery, through the winding of relay 102, conductor 112, terminal 319, brush 320, resistance 1309, outer left back contact of relay 310, middle right back contact of relay 302, upper contacts of cam 1310 to ground at the lower contact of cam 1311. The operation of cut-off relay 102 opens the circuit of line relay 101, removing battery from conductor 114, releasing relays 109 and 301.

At the time relay 302 operated and closed a circuit from ground over conductor 379, terminal 407, brush 406, for operating relay 203, a circuit was also established from brush 406, lower right contact of cam 408, winding of relay 409 to battery through resistance 411. Relay 409 operates and closes a circuit from battery, through the winding of sequence switch magnet 400, upper contact of cam 412 to ground at the outer left front contact of relay 409, advancing sequence switch 400 to position 2. lVhen sequence switch 400 leaves position 1 relay 409 releases. In position 2 a circuit is closed from battery, through the winding of relay 413, left contacts of cam 414, right back contact of relay 415 to ground at the upper right contact of cam 416. Relay 413 operates closing a circuit from battery, through the left winding of relay 417', right front contact of relay 413 to ground at the left back contact of relay 415. Relay 417 in operating closes a circuit from battery, through the winding of up-drive magnet 418 of the sender finder 420, left contact of cam 4'79, outer right contact of relay 417 to ground at the left back contact of relay 409. The sender finder moves upwardly under the control of magnet 418 in search of an idle sender.

Relay 413 also closes a circuit from battery, through the right winding of relay 415, left contacts of cam 421, middle winding of relay 415 to ground at the left front contact of 1 relay 413. The current in this circuit, however, is not sufficient to operate relay. 415, but does create a flux in its magnetic circuit so that it becomes quick to operate when the test circuit is closed. The test circuit extends from brush 422, over the lower contacts of cam 419, right back contact of relay 409, left winding of relay 415, upper right and lower left contacts of cam 421, middle winding of relay 415 to ground through the left front contact of relay 413. An idle sender is characterized by battery connected over conductor 502 to terminal 423. hen, therefore, brush 422 engages terminal 423 corresponding to the sender of Figs. 5 to 10, inclusive, which is assumed to be idle, the test circuit is completed over conductor 502, back contacts of relay 510 and 512 to battery through resistance 501. Relay 415 operates quickly closing a locking circuit for itself from battery through its right winding, left contacts of cam 421 to ground at its left front contact. It also opens the circuit of'relay 417 which releases and in turn releases magnet 418 to bring the sender finder to rest on the terminals of the idle sender. The release of relay 417 in turn releases relay 413. \Vith relay 413 released and relay 415 operated, a circuit is closed from battery through the winding of sequence switch magnet 400, upper left contact of cam 476, contacts 427 of jack 428, left back contact of relay 413, right front contact of relay 415 to ground at the upper right contact of cam 416, advancing sequence switch 400 to position 3.

When sequence switch 400 advanced to posit-ion 2 to hunt for an idle sender, a circuit was closed for relay 321 extending from battery, right winding of relay 321, lower left contact of cam 1312, lower right contact of cam 1313, conductor 375, terminal 477, brush 478 to ground at the right contact of cam 429. WVhen relay 302 releases as above described with relay 321 operated, a circuit is closed for advancing sequence switch 1300 into position 3 extending from battery, winding of magnet 1300, upper left contact of cam 1314, left front contact of relay 321, outer right back contact of relay 302 to ground at the upper left contact of cam 1304. As sequence switch 1300 advances from position 2 to 3, relay 321 releases. From position 3 to 17 the calling line cut-off relay 102 is maintained operated over terminal 319, brush 320, resistance 1309, the left back contact of relay 310 to ground at the upper right contact of cam 1311.

l/Vhen sequence switch 400 reaches position 3, a circuit is closed from ground, through the right and middle windings of relay 503, inner left back contact of relay 504, outer right back contact of relay 505, conductor 506, terminal 430, brush 431, upper contact of cam 434, brush 432 and terminal 433, conductor 322, lower right and upper left contacts of cam 1315 to battery through the winding of relay 323 and inparall'el therewith overthe. upper right contact of. cam 1315, conductor. 1 137 lower contacts of cam1 103, conductor 339toand closes an obvious circuit for relay. 50.7] which. inturu closesa circuit from battery,.. through resistance 508, windingof relay 509,.

middle left. front contact of. relay 507. toground. Relay 509 operates andslocksovcr its inner right. front. contact. Relay 507 closes a at the innerleft. front. contact of relay 507 L It also closes a. circuit fronrbattery,through the winding and" right normal. contact ofrelay 601, normalcontact of-.brush.6.02lof timing switch 600 and thence to ground over con"- ductor'531 to the inner right front contact of relay 507. Theoperatiou of relay 510 closes anobvious circuit for. relay 511 whiclrin-turn closes a circuit. through the. left windingof relay 512.: Theoperation of'relay 601'. closes a circuit frombattery, through the winding of relay 603,.normalterminal and brush 6045 of switch 600. inner left front contact ofrelay 601 to ground... Relay 603'operates and closes a circuit through. thew-inding of stepping magnet 605 audits hack contact, front contact:- of relay 603, brush604 and its normal terminal to ground at the inner left contact of relay 601:. lilagnet. 605" operates and. steps' switch 600 to its first terminal. The furtlier operation of'tlie timing switch will be described later.

The operation of relay 51'2opens'the circuit previously traced'tlirough battery andfresistance 501 and. the windings of relay 4:1 5 and relay e15 releases. With. relay 4:15 released; a circuit is closedfrom battery,.through the winding-cf sequence switch magnet400, lower left contact of cam 176', right back'contact" of relay 415 to ground at the upper rightcontact of cam 116. Sequence switch400'ad ances to position 5 over this circuit and" remams in this position throughout the. further operation of the sender.

As soon as sequence switch 400'arriVed inposition 2% it prepared a puls1ngc1rcu1tfor' receiving. dial pulses. This circuit may be traced from battery, through. the: left wind ing: of relay 606, conductor. 637, left bacliicontact of relay 1200, left. back contact of. relay 1201. conductor 1202,. terminal 145, brush all, lower left and. upper right contacts of cum 1-03; brush 443, terminal 142; conductor 332. left contact of cam 1316, winding of relay 1.317,. outer right back contact of' relay 321. brush 325, terminal. 326, line. conductor 116. substation of calling line 100, line conductor 117, terminal 327, brush 328,. innerright back contactof' relay32s ,.left contact of cam 1318, conductor 375, terminal.477,.brush' circuit for. relay. 510 from. battery, windingofr-elay 51.0,conductor 531 to ground.

478gl0W8I contact of cam 129, brush 4141, term- 111211440,- conductor.1203,.riglit back contact of relay 1204:, right back contact of relay 1200, to ground. Relay606'operates and'closes a circuitfor relay 61'0 extending; from battcny through the windingiof relay 610, front contact ofrelay. 60610 ground at the inner left ba'cltcontact of relay 515.. Relay 610 operates. and closes acircuit from battery, throughthe windingof relay 609, right front contact ofrelay. 610, conductor 638, lower left contactofcam516 to ground. As soon as relay. 609 operates the. dialing tone circuit is completed. from source of tone 607., right winding, of relay 606, normal terminal and brush 804' ofregist'er. steering. switch 800, outermost left. contact of relay 609, conductor 618,.lower contact'ofcani 51 1, conductor 531 to ground at the inner left frontcontactof relay 507. Due to the closure of this circuit a tone is induced in. the. left. winding. of. relay 606and over the dialing. circuit to the receiver ofrthe. calling. suhscribers substation to inditionecl sequence switch 500 is advanced to position 2.. V

\Vit-h sequence switch 500in position 2. the fundamental circuit is completed from bat tery, through the right winding of relay 321', lower left contact ofcam 1312', lower left; contact of cam 1313, conductor 378, ten minal 401, brush 402,3lowcr right and upper left contacts of cam. 435, brush 436, terminal 437", right back contact of relay 50 1, right contact ofcam 701, winding of stepping relay 702; back cont-at of'relay 703, left wind ing ofrelay. 704', leftcontactof cam 705, inner left. contact of relay 620',- mid'dl'e left con.-

tact. of relay 621, resistance 623 to ground,

relays 620' and 621 having energized. upon the setting of. thetranslator. switch: 830 in the manner set: fortlr in. the aforementioned patent to.O..H. Kopp. Relays 321 and 7.02operatein this circuit,.but relay 7 01' being. polarizeddoesnot operate- Relay 321=locks over itsinner; right. front contact, the: upper left contact of cam: 1312 tothe fundamental circuitt as previously tracedi winding of: sequence switch n1agnetf1300,.upper left contact of cam 1314:,1eft front con tact of relay 321-, outer right baclt contact of'relay302toground at the upper left con-- tact of cam 1304; Magnet 1300 energizes in this circuitancl advances the sequence switch;

Relay 321 also closes' acircuit. from battery, through.- the: 

